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    <title>Document</title>
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      // var a = 1,
      //   b = 2;
      // console.log(a % b);

      // var xd = '小滴';
      // var kt = '课堂';
      // console.log(xd + kt);

      // var xd = '小滴';
      // var kt = 22;
      // console.log(xd + kt);

      // var list = [1, 2, 3]; '1,2,3'
      // var num = 2; '2'
      // console.log(num + list);

      // var a = 2;
      // // --a;
      // var b = --a + 5;
      // console.log(b);

      var a = 3;
      var b = 4 + a--;
      console.log(b);
      console.log(a);
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